From c958b9ffccedb8cac37e4165904608228b847c5d Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop@gmail.com>
Date: Wed, 13 Sep 2023 10:57:45 -0400
Subject: [PATCH] Remove alpha-blending framebuffer functions

---
 src/hulk/fb.d | 79 ---------------------------------------------------
 1 file changed, 79 deletions(-)

diff --git a/src/hulk/fb.d b/src/hulk/fb.d
index b20a96c..0bfe60d 100644
--- a/src/hulk/fb.d
+++ b/src/hulk/fb.d
@@ -131,70 +131,6 @@ struct Fb
         }
     }
 
-    /**
-     * Draw a character.
-     *
-     * @param x X coordinate of left side of character.
-     * @param y Y coordinate of bottom side of character.
-     * @param ch Character to draw.
-     * @param color Color of character.
-     */
-    static void character(int x, int y, char ch, uint color)
-    {
-        const(CharInfo) * ci = &Kfont.chars[ch];
-        blend_alpha_bitmap(x + ci.left, y + Kfont.baseline_offset + ci.top - ci.height, ci.bitmap, ci.width, ci.height, color);
-    }
-
-    /**
-     * Blend an 8-bit alpha bitmap to the framebuffer.
-     *
-     * @param x X coordinate of left side of target location.
-     * @param y Y coordinate of bottom side of target location.
-     * @param alpha_bitmap 8-bit alpha-channel bitmap.
-     * @param width Bitmap width.
-     * @param height Bitmap height.
-     * @param color Color to blend with alpha value.
-     */
-    static void blend_alpha_bitmap(size_t x, size_t y, const(ubyte) * alpha_bitmap,
-            size_t width, size_t height, uint color)
-    {
-        y += height - 1u;
-        size_t bitmap_index;
-        for (size_t iy = 0u; iy < height; iy++)
-        {
-            size_t row_buffer_index = buffer_index(x, y);
-            for (size_t ix = 0u; ix < width; ix++)
-            {
-                size_t buffer_index = row_buffer_index + ix;
-                ubyte alpha = alpha_bitmap[bitmap_index];
-                uint current_color = m_buffer1[buffer_index];
-                uint in_color_scaled = scale_color(color, alpha);
-                uint old_color_scaled = scale_color(current_color, 255u - alpha);
-                uint new_color = old_color_scaled + in_color_scaled;
-                m_buffer1[buffer_index] = new_color;
-                bitmap_index++;
-            }
-            memcpy32(&m_device_buffer[row_buffer_index], &m_buffer1[row_buffer_index], width);
-            y--;
-        }
-    }
-
-    /**
-     * Blend an 8-bit alpha bitmap to the framebuffer.
-     *
-     * @param x X coordinate of left side of target location.
-     * @param y Y coordinate of bottom side of target location.
-     * @param alpha_bitmap 8-bit alpha-channel bitmap.
-     * @param width Bitmap width.
-     * @param height Bitmap height.
-     * @param color Color to blend with alpha value.
-     */
-    static void blend_alpha_bitmap(size_t x, size_t y, const(ubyte)[] alpha_bitmap,
-            size_t width, size_t height, uint color)
-    {
-        blend_alpha_bitmap(x, y, alpha_bitmap.ptr, width, height, color);
-    }
-
     /**
      * Blit an 8-bit alpha bitmap to the framebuffer.
      * The foreground will be white (based on the alpha value), and the
@@ -262,21 +198,6 @@ struct Fb
                 (m_stride * height));
     }
 
-    /**
-     * Scale a color value by an alpha amount.
-     *
-     * @param color Color value.
-     * @param alpha Alpha amount.
-     *
-     * @return Scaled color value.
-     */
-    private static uint scale_color(uint color, ubyte alpha)
-    {
-        return ((((color & 0xFFu) * alpha) >> 8u) & 0xFFu) |
-               ((((color & 0xFF00u) * alpha) >> 8u) & 0xFF00u) |
-               ((((color & 0xFF0000u) * alpha) >> 8u) & 0xFF0000u);
-    }
-
     /**
      * Return the buffer index for the given X and Y coordinates.
      *